Bolting means for grinding machines



-Aug; 1, 1939.

H. J. MANKOFF BOLTING MEANS FOR GRINDING MACHINES 2 Sheets-Sheet lFiledyJuly 10, 1957 IN VENTQR. J ffA/VAMF BY fiZWH Y AITORNEYI Aug. 1,1939. MANKOFF 2,167,954

BOLTING MEANS FOR GRINDING MACHINES Filed July 10, 1957 2 Sheets-Sheet 2FIG. 5 Fit/.5

ATTORNEY Patented Aug. 1, 1939 UNITED STATES PATENT OFFICE BOLTINGMEANS'FOR GRINDING MACHINES Henry John Mankoff, Wichita, Kans.Application July 10, 1931, Serial No. 152,964

1 Claim.

This invention relates to improvements in bolting means for substanceground by a machine and has for its chief object the ability ofproducing a finished product at one operation of 5 grinding, that is tosay, no by-products are prosecured in working relation to a rotatablegrind- I er trunnioned in the machine at the axis of the frame, and thesaid frame being so arranged will also receive and firmly bind in likeposition, a finely woven wire screen as bolting means for all of thesubstance being ground.

A still further object of my invention is to provide an adjustable frameas supporting means for a woven screen, clamping the entire peripheraledge securely to avoid intermediate sagging of the screen during thegrinding process, the screen, however being free to vibrate,

facilitating its sifting or bolting efficiency.

These and other objects will hereinafter be more fully explained,reference being had to the accompanying drawings forming a part of thisspecification and in which like characters will apply to like parts inthe different views.

Referring to the drawings:-

Fig. 1 is a sectional view through the grinding machine showing theinstallation of the frame in working relation to the grinder.

removed and other parts of structure for convenience of illustration.

Fig. 3 is an end view of the frame.

Fig. 4 is a plan View of Fig. 3.

Fig. 5 is an end view of the screen, showing the bent position of itsoppositely disposed straight edges.

Fig. 6 is a plan view of Fig. 5.

Fig. '7 is a vertical sectional view through one 45 end of the grinderhousing and screen frame.

Fig. 8 is a similar view to Fig. '7, omitting the frame and screen.

Fig. 9 is a sectional view taken on line 9-9 in Fig. 3, one end of theframe removed.

Fig. 10 is an enlarged sectional view at the top of the frame, showingthe method of bending the screen to its clamped position by a rockingmovement of the hood enclosure for the hammer grinder.

My invention herein disclosed consists of a.

Fig. 2 is a plan view of Fig. 1, the grinder frame element comprisingtwo semi-circular ends -I, said end members being connected. by anglebars 2 respectively, and a rod 3 medially connecting said end members,the said frame pendently supported by bolts 4, secured to said bars andupwardly extending to engage through inturned portions 5, of sides 8,the said sides having end units 1 secured thereto, functioning as anexternal housing for'the base of the grinding machine, While the saidframe is enclosed by an internal housing 8, extending to and being"connected to ends 1, respectively, and to said sides as at A, the lastsaid housing to receive the ground substance bolted through screen 9,positioned 'on the inside of said frame andsecured therein as follows.

The said bolting screen may be cut or manufactured in width to extendflush with the o-ut side of each arcuate end I, of said frame and beingcurved to seat snugly upon the inside periphery thereof, while each sideextends a short distance above its: respective bar 2 of the frame and isbent outward thereon as shown at B in Figs. 1 and 2.

The said'bolting screen being thus placed on the frame and securedthereto, as later described, will be positioned in working relation to arotatable grinder X as shown in Fig. 1, and the positioning of whichwill automatically secure both end edges between the inner edge of thesemi-circular end members and their respective arcuate shoulders 1,against which the frame ends are tensioned by said bolts 4; and theoutward bent portions of the screen. as at B at each side are alsoautomatically secured by rocking hood 10 on its pivot C, to a closedposition over grinder X, said hood being secured to snug engagement byanchor bolts H, while the rim portions adjacent their respective sides.of the screen will seat firmly thereon, securing the said side portionrigidly to bars 2.

In Fig. 5 is shown, a marginal edge portion of the bolting screen turnedoutward as shown by dotted lines B, one side of which it is convenientto turn downward on its respective bar, while the other side is adjacentthe hinged point of the hood. In the case of the latter, the edge ofsaid hood, as shown by its dotted line of travel, will contact the upperedge of the screen, bending it outward and downward as shown by dottedlines, as the hood is rocked to its closed position, clamping the samefirmly to its respective bar member 2, while the other side is securedby the free edge of said hood resting thereon as shown in Fig. 1.

relation to a rotatable hammer grinding cylinder; furthermore, the saidadjustably positioned frame as constructed, will permit the installationof a finely perforated metallic sheet positioned in said frame andsupported thereby, in which case, the said frame is placed on a lowerplane,

and the securing of the sides and ends of said sheet is not required,however the said sheet is forced to conform with the arcuate interior ofthe frame by the hood contacting each side,

forcing the same downward at the time of tensioning the anchor boltsheretofore described.

Attention is directed to the fact that the perforations of the metallicsheet are not as impervious as the finely woven screen with respect tobolting or sifting of the substance passing therethrough as ground, andthe flexing tendency of the screen is a means to agitate it sulficientlyto avoid congestion; and as heretofore stated, the woven strands of thescreen afiord a finely interrupted surface against which the substancebeing ground will contact, co-operating with the grinding cylinder, andto maintain uniformity of the arc of the screen, the peripheral edgesthereof, are firmly secured to the frame as heretofore described.

Such other modifications may be employed as lie within the scope of theappending claim, and having fully described my invention what I claim asnew and desire to secure by Letters Patent is:

A structure of the character described comprising a casing having rigidend members, side members connected with the end members, arcuate,inwardly extendingflanges formed on the end members, the ends of saidflanges terminating adjacent the upper edges of the end members, saidside members having inturned horizontal flanges,'jai hood for saidcasing pivotally connected with one horizontal flange and adapted to'close the upper end of said casing, means for locking said hood inclosed position, a frame device arranged in said casing and comprisingsemi-circular end members rigidly connected in spaced relation by anglebars at their upper ends, the upper edges of the semi-circular membersformed upon an arc corresponding to the arc of the end flanges andadapted to engage therewith,

a sheet of wire gauzing arranged in said casing .with two opposite edgesengaging beneath the endfianges, bolts carried by the said flanges andengaging the angle bars for rigidly binding the edges of the gauzebetween the end flanges and the arcuate, upper edges of the frame ends,the

opposite edges of the gauze extending above the frame bars andbentthereover, said hood when in its closed position adapted to bind thefree edges of the gauze upon the angle bars.

' I ENRY; JOHN MANKOFF.

